21003223123 has 8 divisors (see below), whose sum is σ = 21830771088. Its totient is φ = 20189353824.

The previous prime is 21003223097. The next prime is 21003223139. The reversal of 21003223123 is 32132230012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21003223123 - 2²⁹ = 20466352211 is a prime.

It is a super-2 number, since 2×21003223123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21003223123.

It is not an unprimeable number, because it can be changed into a prime (21003223823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3416536 + ... + 3422677.

It is an arithmetic number, because the mean of its divisors is an integer number (2728846386).

Almost surely, 2^21003223123 is an apocalyptic number.

21003223123 is a deficient number, since it is larger than the sum of its proper divisors (827547965).

21003223123 is an equidigital number, since it uses as much as digits as its factorization.

21003223123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6839333.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21003223123 its reverse (32132230012), we get a palindrome (53135453135).

It can be divided in two parts, 2100 and 3223123, that added together give a palindrome (3225223).

The spelling of 21003223123 in words is "twenty-one billion, three million, two hundred twenty-three thousand, one hundred twenty-three".